Linux

systemctl start service_name

systemctl stop service_name

systemctl enable service_name

systemctl disable service_name

systemctl status service_name

sudo chkconfig service_name on

sudo chkconfig service_name off

sudo chkconfig service_name status

bash --noprofile --norc starts a completely clean, bare-bones Bash shell without running any of your normal startup scripts.

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What it does

When you start Bash normally, it loads several configuration files, such as:

• /etc/profile → system-wide environment variables

• ~/.bash_profile, ~/.bash_login, ~/.profile → user login scripts

• ~/.bashrc → aliases, functions, prompt settings, etc.

These can set your PATH, prompt, aliases, etc.
Sometimes you don’t want that — especially when testing or running untrusted scripts.

The flags:

• --noprofile → skip /etc/profile and any personal profile files.

• --norc → skip reading ~/.bashrc.